摘要
介绍了空间复用-空时块码(SM-STBC)系统的基本原理和接收算法,对基于迫零(ZF)准则的检测算法的性能进行了理论分析,给出了采用ZF检测后的输出信噪比的概率密度分布函数,进而得到该接收算法下的分集增益大小和无信道编码下的误码率性能表达式,并通过计算机仿真印证了理论推导的正确性.从理论分析和仿真结果可以看出,通过在空间复用发射端引入STBC技术,在损失了部分复用增益的情况下能大大提高空间分集增益,获得更好的链路误码率性能.
The basic principle and receiver algorithms of spatial multiplexing-space time block code （SM-STBC） system are introduced. The performance of detection algorithm based on zero-forcing （ZF） principle is analyzed theoretically, the probability density function of the output signal-to-noise ratio （SNR） is given. Therefore, the diversity gain and un-coded bit error rate （BER） expressions are derived and verified by computer simulation. Both theory analysis and simulation results demonstrate that SM-STBC can achieve nauch more diversity gain, i.e. better BER performance, at the price of loss of partial multiplexing gain.
出处
《北京邮电大学学报》
EI
CAS
CSCD
北大核心
2007年第3期83-87,共5页
Journal of Beijing University of Posts and Telecommunications
基金
国家自然科学基金项目(60372101)
关键词
多入多出
空间复用
空时块码
迫零检测
分集增益
multiple-input multiple-output
spatial multiplexing
space-time block code
zero-forcing detector
diversity gain
